用递等式计算,能简算的要简算. (1)2- 5 11 ÷ 9 22 - 8 9

2024年11月07日 09:56
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(1)2-
5
11
÷
9
22
-
8
9

=2-
10
9
-
8
9
,猜颤饥
=2-(
10
9
+
8
9
),
=2-2,
=0;

(2)6÷[(
3
5
+
1
10
)×
5
21
],
=6÷[
7
10
×
5
21
],
=6÷
1
6

=36;

(3)41×9.9+4.1,
=4.1×99+4.1,
=4.1×(99+1),
=4.1×100,
=410;

(4) (
5
12
+
1
9
+
3
8
)×72

=
5
12
×72+
1
9
×72+
3
8
×72,
=30+8+27,
=38+27,
=65;

(5)穗返754-(302+459÷51),
=754-(302+9)洞碰,
=754-311,
=443;

(6)9×(
2
9
-
1
13
)×13,
=9×
2
9
×13-9×
1
13
×13,
=26-9,
=17.